Aperture, Shutter Speed, and ISO

A photo taken at F2.8 aperture. 

A photo taken at F16 aperture.

1. The Pupil is just like the aperture.

2. The smaller the Aperture the more light, the higher the Aperture less light.

3. The lower the aperture the more background blur you will have. IF set higher the whole picture will be sharp and focused

This picture shows that having a slow shutter speed vs a fast one.

1.

a. 1/30

b. 1/30

c. 1/200

d.1/400

e.1/300

f.1/800

1.2

a.1/30

b.1/30

c.1/30

d.1/30

e.1/30

f.1/30

2.There is Auto mode which sets speed and aperture. There is Shutter Priority which is where you set the Shutter Speed and the camera does the rest. Then there is manual where you set both Aperture 

and Shutter Speed.

This photo shows the differences between ISO 200 and ISO 3200. Look at the girls cheek detail to compare.

Shooting at high ISO at football games means you can lower your shutter speed to get faster pictures.
Use low ISO when you have lots of light and a slow shutter speed.
Use high ISO in low light conditions but not too mush otherwise your photo will be blurry.

2.6 - 22
1-1/4000 sec
100-25600